Bracket.



C. H. RICHARDSON & P. F. METZGER.

BRACKET.

APPLIOATION FILED AUG. 10, 1910.

Patented F612. 25, 1913.

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INVENTORS X JVMAML W ATTORNEY WNSES 4 i COLUMBIA PLANonRAPu conwumNmoN.I). c.

G. H. RICHARDSON & F. F. METZGER.

BRACKET. v APPLIOATION FILED 4110.10, 1910.

1 054 241 Patented Feb. 25, 1913.

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G. H. RICHARDSON 6; F. F. METZGBR.

BRACKET.

APPLICATION FILED AUG. 10, 1910.

Patented Feb. 25, 1913.

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WITNESSES ATTORNEY COLUMBIA PLANOnRAPIl C0.,VIA.S NINGTON, D. C

UNITED STA'EItS PATENT OFFICE.

CHARLES H. RICHARDSON AND FERDINAND F. METZGER, OF PHILADELPHIA,PENNSYLVANIA.

BRACKET.

To all whom it may concern:

Be it known that we, CHARLES 11. R1011- QARDSON and FERDINAND F. hInrrzenn, citizens of the United States, and residents of the city andcounty of Philadelphia, State of Pennsylvania, have invented certain newand useful Improvements in Brackets, of which the following is aspecification.

Our invention relates to improvements in extensible brackets such, forinstance, as are used to carry a dental engine, a chest of drawers, atable, a telephone, or other article, our object being to furnish anextensible or folding bracket which will be simple and practical inconstruction, rigid and el'licient in action which will have the maximumreach when open, which will occupy but little space when closed, andwhich will preserve the posit-ion of the object or objects supported ina thoroughly acceptacle manner at all times.

Our present invention is a modification of the form of bracket shown anddescribed in an application Serial Number 552,515 filed March 31st,1910, and allowed June 8th, 1910, the essential difference between thetwo being that in the above application the controlling rods whichdirect the movements of the main arms extend continuously from one mainarm to the next alternate main arm and parallel to the intermediate mainarm, the said arms and controlling rods being pivotally connected ingroups, each group consistin of a main arm and a controlling rod, whifein the present invention the controlling rods are made in two pieces,one of which is placed close to one side of the intermediate arm, andthe other close to the other side of this arm, the inner ends of thesetwo pieces being secured, the one, to one end, and the other to theother end of a lever which is pivoted to and which crosses theintermediate main arm at a point between the ends of this arm; and theouter ends of which are pivoted to the alternate arms, the said mainarms and controlling rods forming groups each of which consists of amain arm and three units or links, two of which are connected toalternate arms and to the third link, which latter crosses and ispivoted to the intermediate arm.

This construction may be modified by pivoting to adjacent ends ofadjoining main arms two levers, pivoting together one of Specificationof Letters Patent.

Application filed August 10, 1910.

Patented Feb. 25, 1913.

Serial No. 576,524.

the ends of said levers, and pivoting to the other ends of said leversone end of controlling rods, the other ends of which are pivoted to mainarms as more fully set forth hereinafter. In this latter constructionthe levers not only perform their function to connect the controllingrods but also form themselves part of these rods.

In the accompanying drawings forming part of this specification, and inwhich simi- .ar letters of reference indicate similar parts throughoutthe several views: Figure 1, is a side elevation of a folding bracketembodying our invention, the lever connecting the controlling rodspassing above or below and crossing the middle of the intermediate mainarms; Fig. 2, a plan of Fi 1; Fig. 3, a view similar to Fig. 1, some ofthe levers connecting the controlling rods passing across theintermediate main arms. to one side of the center of these arms, and therods and levers partly within the frame of the main arms and partlywithout; Fi 4, a plan of Fig. 3; Fig. 5, a side elevation of ourinvention applied to a bracket in which the main arms are mountedprogressively one above the other; Fig. (5, a plan of Fig. 5; Fig. 7 aside elevation of our bracket as applied to a bracket in which the mainarms are placed alternately above and below one another; F 8. a plan ofFig. 7; Fig. 9, a diagrammatic plan of a modified form of bracket shownin Fig. 2; Fig. 10, a

plan of the form of bracket shown in Fig. 4,

the arms 99 being straight.

Our bracket is formed of three or more main arms pivoted one to theother at or near their ends so that they can be extended to form anearly straight line or folded together side by side, and our inventionconsists in furnishing particular means for causing all of said mainarms to open or close simultaneously and in such a manner that a similarangular relation will be maintained between the several. arms at alltimes.

1, 2, 3, 4, 5, (3, 7 are the main arms which are secured together, at ornear their ends, by pivots 8 around which they can rotate, turn, orswing. The relative length of the arms is immaterial so far as ourinvention is concerned, but it is preferable in order that a.symmetrical appearance may be maintained, nlrticularly when the bracketis folded or closed, that the extreme rear and front arms, 1 and 7, beapproximately onehalf the length of the next adjoining arms as shown inthe drawings.

The arms intermediate of the end arms may be of equal length, as shownin Figs. 1, 2, 5, 6, 7, 8, or they may successively decrease in lengthtoward the outer end of the bracket as shown in Figs. 3 and 4. The latter construction presenting the neatest appearance is, perhaps, to bepreferred.

The main arms 1, 2, 3, 4, 5, etc., may be pivoted one inside the otheras shown in Figs. 1, 3 or they may be pivoted above or below each otheras shown in Figs. 5 and 7.

Connecting each alternate main arm are means for causing any movement ofany one main arm around its pivotal connection to the next arm to impartto the other main arms a similar angular movement. In the presentinvention these means consist of pairs of controlling rods, 9, 9, and alever 9 the latter of which is pivoted to the main arms at theircenters, as shown in Figs. 1, 2, 5, 6, 7 and 8, or to one side of theircenters as shown in Fig. 9, and partly at the center and partly to oneside of the center as shown in Figs. 3, 4 and 10.

The lever 9 may be one continuous piece as shown in Figs. 1, 2, 3, 4, 7and 8, or it may be of two crank-like pieces the inner ends of which aresecured to a pivot 9 as shown in Figs. 5 and 6.

The inner ends of the rods 9, 9, are se-- cured to opposite ends of thelever 9 while the outer ends of these rods are secured one to the mainarm pivoted to one end of the arm carrying the lever 9 the other to themain arm pivoted to the other end of this lever carrying arm. Forconvenience, we will call the arms carrying the levers the intermediatearms and the arms pivoted to the ends of this arm the alternate arms.

In the drawings levers 9 are pivoted to arms 2, 3, 4, 5, 6. Thecontrolling rods 9, 9 secured to lever 9 on arm 2 are also secured toarms 1 and.3. Those secured to lever 9 on arm 8 are also secured to arms2 and 4 and so on, the connections between the rods and the levers andthe rods and the arms being pivotal.

The rods 9, 9 are upon opposite sides of the arm which carries theirlever 9 and the centers of the several pivots upon each arm and leverare preferably all in line as inclicated by the broken lines in Figs. 2,4, 6 and 8, and in order that the rods 9, 9 when situated between theframes may not engage the pivots of the main arms, or the bosses onthese arms, when said arms are fully opened or fully closed they arebent or recessed at 18. The rods 9 and 9 are also I bent or recessed at18 so they will clear the pivot bosses on the levers 9 when the armsfere with the close folding of the arms and for the same reason wherethe rods are inside the frame the webs 19 connecting the top and bottomchords of the main arms are beveled. These features were fully set forthin our application above referred to and will not need detaileddescription here.

The several controlling rods 9 9 and lever 9 will cause each alternatemain arm, as 1, 3, 5, 7 and 2, 4, 6 to open and close parallel to oneanother, hence, in any position of the bracket the angles formedbet-ween the main arms will always be equal. Thus a synchronous movementof the main arms is secured, and the outer end of the bracket, which isadapted to carry an engine, a table, or other object, is caused to movein or out from the supported or wall end 17 in a straight or practicallystraight line as in our application before referred to.

In Fig. 9 a modified form of bracket is shown in which the levers 9cross the main arms near their ends. In this case the adjacent levers 9are pivoted together at one of their ends, their middles are pivoted tothe main arms, and their outer ends are pivotally connected to the rods9 which latter are also pivoted to the main arms as shown. The operationof this form of the device is similar to that already described inconnection with the other figures of the drawings.

In the drawings we have shown the pivots of the several levers and armsall in line but this construction, while preferred, is not necessary tothe operation of the bracket as the pivots may be out of line as setforth in connection with Fig. 12 of our previous application beforereferred to.

Having thus described our invention we claim as new and desire to secureby Letters Patent In an extensible bracket, in combination, three ormoremain arms pivoted together end to end, a short lever pivoted to andcrossing a main arm intermediate of two other main arms, and controllingrods substantially parallel to and arranged in pairs upon opposite sidesof said intermediate main arm and having their inner ends pivotallyconnected to the outer ends of said lever and their outer ends pivotallyconnected one to the main arm pivoted to one end of the intermediatemain arm and the other to the main arm pivoted to the other end of theintermediate main arm.

CHARLES H. RICHARDSON. FERDINAND F. METZGER. Witnesses:

GEO. H. HILL, Jr,

CHARLES A. BUTTER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

